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Earnings Per Share - Additional Information (Detail)	3 Months Ended	6 Months Ended
Earnings Per Share - Additional Information (Detail)	Jun. 30, 2013	Jun. 30, 2013
Earnings Per Share [Line Items]
Options granted to purchase of common stock	104,444
Diluted effect	8,555	4,278
Restricted Stock [Member]
Earnings Per Share [Line Items]
Nonvested shares issued to members and directors	136,080	136,080
Performance Shares [Member]
Earnings Per Share [Line Items]
Nonvested shares issued to members and directors	98,441	98,441

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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